21507464232375 has 32 divisors (see below), whose sum is σ = 39041913261312. Its totient is φ = 10427861444000.

The previous prime is 21507464232323. The next prime is 21507464232389. The reversal of 21507464232375 is 57323246470512.

It is not a de Polignac number, because 21507464232375 - 2¹⁸ = 21507463970231 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2606961237 + ... + 2606969486.

It is an arithmetic number, because the mean of its divisors is an integer number (1220059789416).

Almost surely, 2^{21507464232375} is an apocalyptic number.

21507464232375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21507464232375 is a deficient number, since it is larger than the sum of its proper divisors (17534449028937).

21507464232375 is a wasteful number, since it uses less digits than its factorization.

21507464232375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5213930752 (or 5213930742 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 51.

The spelling of 21507464232375 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty-four million, two hundred thirty-two thousand, three hundred seventy-five".